Relevance of tidal effects and post-merger dynamics for binary neutron star parameter estimation

Reetika Dudi, Francesco Pannarale, Tim Dietrich, Mark Hannam, Sebastiano Bernuzzi, Frank Ohme, and Bernd Brügmann
Phys. Rev. D 98, 084061 – Published 31 October 2018

Abstract

Measurements of the properties of binary neutron star systems from gravitational-wave observations require accurate theoretical models for such signals. However, current models are incomplete, as they do not take into account all of the physics of these systems: some neglect possible tidal effects, others neglect spin-induced orbital precession, and no existing model includes the post-merger regime consistently. In this work, we explore the importance of two physical ingredients: tidal interactions during the inspiral and the imprint of the post-merger stage. We use complete inspiral–merger–post-merger waveforms constructed from a tidal effective-one-body approach and numerical-relativity simulations as signals against which we perform parameter estimates with waveform models of standard LIGO-Virgo analyses. We show that neglecting tidal effects does not lead to appreciable measurement biases in masses and spin for typical observations (small tidal deformability and signal-to-noise ratio 25). However, with increasing signal-to-noise ratio or tidal deformability there are biases in the estimates of the binary parameters. The post-merger regime, instead, has no impact on gravitational-wave measurements with current detectors for the signal-to-noise ratios we consider.

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  • Received 29 August 2018

DOI:https://doi.org/10.1103/PhysRevD.98.084061

© 2018 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Gravitation, Cosmology & Astrophysics

Authors & Affiliations

Reetika Dudi1, Francesco Pannarale2,3, Tim Dietrich4, Mark Hannam2, Sebastiano Bernuzzi1,5, Frank Ohme6,7, and Bernd Brügmann1

  • 1Theoretical Physics Institute, University of Jena, 07743 Jena, Germany
  • 2Gravity Exploration Institute, School of Physics and Astronomy, Cardiff University, The Parade, Cardiff CF24 3AA, United Kingdom
  • 3Dipartimento di Fisica, Università di Roma “Sapienza” & Sezione INFN Roma1, P. A. Moro 5, 00185, Roma, Italy
  • 4Nikhef, Science Park, 1098XG Amsterdam, Netherlands
  • 5Istituto Nazionale di Fisica Nucleare, Sezione Milano Bicocca, gruppo collegato di Parma, Parco Area delle Scienze 7/A, I-43124 Parma, Italy
  • 6Max Planck Institute for Gravitational Physics (Albert Einstein Institute), Callinstraße 38, 30167 Hannover, Germany
  • 7Leibniz Universität Hannover, 30167 Hannover, Germany

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Issue

Vol. 98, Iss. 8 — 15 October 2018

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